Study the given diagram carefully and answer the question that follows. The numbers in different sections indicate the number of persons. (NOTE: You have to take the given data to be true even if they seem to be at variance from commonly known facts.)

How many managers are there?

The correct option is 43.

To find the total number of managers, we need to analyze the circle labeled Managers in the given Venn diagram. This circle is divided into sections representing individuals who are either only managers or managers sharing other categories (Marketeers and Females).

Let's identify the numbers located within the Managers circle:
1. Managers only (the region belonging exclusively to the Managers circle): 13
2. Managers who are also Marketeers (intersection of Managers and Marketeers circles only): 15
3. Managers who are also Females (intersection of Managers and Females circles only): 6
4. Managers who are both Marketeers and Females (intersection of all three circles): 9

To find the total number of managers, we sum the values of all these regions:

$$\text{Total Managers}=13+15+6+9$$

Let's calculate this step-by-step:
13 + 15 = 28
28 + 6 = 34
34 + 9 = 43

Therefore, there are a total of 43 managers.